linux-kernel - Re: [PATCH][RT] tracing: Show padding as unsigned short

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Date:	Sat, 19 Nov 2011 14:09:22 +0100
From:	John Kacur <jkacur@...hat.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	linux-rt-users <linux-rt-users@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH][RT] tracing: Show padding as unsigned short

On Wed, Nov 16, 2011 at 7:19 PM, Steven Rostedt <rostedt@...dmis.org> wrote:
> RT added two bytes to trace migrate disable counting to the trace events
> and used two bytes of the padding to make the change. The structures and
> all were updated correctly, but the display in the event formats was
> not:
>
> cat /debug/tracing/events/sched/sched_switch/format
>
> name: sched_switch
> ID: 51
> format:
>        field:unsigned short common_type;       offset:0;       size:2; signed:0;
>        field:unsigned char common_flags;       offset:2;       size:1; signed:0;
>        field:unsigned char common_preempt_count;       offset:3;       size:1; signed:0;
>        field:int common_pid;   offset:4;       size:4; signed:1;
>        field:unsigned short common_migrate_disable;    offset:8;       size:2; signed:0;
>        field:int common_padding;       offset:10;      size:2; signed:0;
>
>
> The field for common_padding has the correct size and offset, but the
> use of "int" might confuse some parsers (and people that are reading
> it). This needs to be changed to "unsigned short".
>
> Signed-off-by: Steven Rostedt <rostedt@...dmis.org>
>
> diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
> index 37d3ffb..c71844c 100644
> --- a/kernel/trace/trace_events.c
> +++ b/kernel/trace/trace_events.c
> @@ -117,7 +117,7 @@ static int trace_define_common_fields(void)
>        __common_field(unsigned char, preempt_count);
>        __common_field(int, pid);
>        __common_field(unsigned short, migrate_disable);
> -       __common_field(int, padding);
> +       __common_field(unsigned short, padding);
>
>        return ret;
>  }
>

This one should also be included in 3.0.9-rt26
Thanks

John Kacur
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